Question

A block of mass 20 kg kept on a rough
horizontal surface can be maintained in
uniform motion in a straight line when a force
of 100 N is applied to the body in the direction
of its motion. Find coefficient of kinetic friction
between the surfaces.​

Answer 1

Answer:

12 N.

Explanation:

Given :

Mass of block = 20 kg

Force = 12 Newton

Coefficient of the friction = 0.1

Find the maximum possible frictional force :-

f _{maxs} = \mu_s \: \\ R \: = \mu_s \\ \\ mg = 0.1 \times 20 \times 9.8 = 19.6 \: N

Since,

The applied force is 12 N

(which is less than 19.6 N)

Therefore,

The frictional force will be 12 N.